Traveling to the United States, on weekends, take the subway to the Smithsonian Museum District, and take a trip to most of the museums here, this museum is one of them. It is natural and scientific, and all museums have their own themes, and if you have a need to visit a museum, go directly to that one. The museum needs security check when entering the door. If the security check is strict during the peak period, in general, take a small stick and pick your bag to see, and people will pass the security check door.